[bisq-network/bisq] Reword "trade started" popup messages per suggestion (#5091)

[jmacxx]

![image](https://user-images.githubusercontent.com/47253594/104974417-90ebde00-59bd-11eb-95f1-2a2767ef28e9.png)
@m52go :point_up_2: 
@Conza88  thanks for finding the typo.

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